Mississippi Process Piping Examination

In pipe welding qualification, what describes the 6G position?

• AThe pipe is rotated on a horizontal axis while the welder stays in the flat position
• BThe pipe is fixed vertically and the weld is made in the horizontal position
• CThe pipe is fixed with its axis at 45 degrees and is not rotated during welding
• DThe pipe is fixed horizontally and the welder works only from the top

What describes a 5G pipe weld?

• AThe pipe is fixed horizontally and is not rotated, so the weld progresses through overhea…
• BThe pipe is rolled continuously so every pass stays in the flat position
• CThe pipe stands vertically and the weld is a single horizontal bead
• DThe pipe is inclined at 45 degrees and rolled toward the welder

Which setup is the 2G pipe welding position?

• APipe axis horizontal, pipe rolled, weld kept flat
• BPipe axis horizontal and fixed, weld made all the way around
• CPipe axis at 45 degrees and fixed
• DPipe axis vertical and fixed, weld made horizontally around the pipe

Why is an E6010 electrode commonly chosen for the open-root pass on carbon-steel process pipe?

• AIt is a low-hydrogen fill electrode that needs an oven and produces a heavy slag cover
• BIt is a cellulose electrode with a forceful, digging arc that can keyhole and penetrate a…
• CIt is intended only for fillet welds on galvanized sheet
• DIt must be used with AC and a short-circuit GMAW transfer

What storage practice is required for E7018 low-hydrogen electrodes after the hermetic container is opened?

• ALeave them on the bench overnight so they pick up moisture and run cooler
• BStore them in a heated holding oven so they stay dry until use
• CSoak them in water to prevent porosity
• DRefrigerate them below freezing to harden the flux

When fitting a socket-weld joint for ASME B31 process piping, what gap is provided between the pipe end and the bottom of the socket before welding?

• AThe pipe is bottomed hard against the socket shoulder with no gap
• BAn approximate 1/16 inch (1.5 mm) gap is left before welding
• CA 3/8 inch gap is required so the fillet can shrink freely
• DA 1/2 inch gap is required on all NPS 2 and larger sockets

Why is an inert-gas back purge used when GTAW welding the root of stainless-steel process pipe?

• ATo quench the root so the weld metal becomes fully martensitic
• BTo force the keyhole open with compressed air from inside the pipe
• CTo replace the shielding gas so no torch gas is needed
• DTo keep air off the inside of the root so the metal does not oxidize or sugar

On a typical single-V butt weld in carbon-steel pipe, which three fit-up dimensions must match the WPS before the root pass?

• ABolt-circle diameter, gasket ID, and flange face finish
• BBevel angle, root face (land), and root opening (gap)
• CThread pitch, engagement length, and dope thickness
• DInsulation density, jacket gauge, and vapor-barrier lap

Internal high-low (radial misalignment) at a pipe butt joint is primarily a concern because it can:

• AIncrease the pipe outside diameter enough to change the nominal pipe size
• BCreate a stress riser and make complete root fusion more difficult
• CConvert a groove weld into a socket weld
• DEliminate the need for a root opening

E6010 and E7018 pipe electrodes are typically welded with which current and polarity?

• ADC electrode positive (DCEP / reverse polarity)
• BDC electrode negative only, never reversed
• CStraight AC with no electrode lead
• DPulsed nitrogen from the torch only

Compared with an open-root butt weld, a backing ring in carbon-steel process pipe is used mainly to:

• AIncrease the pipe schedule by adding internal reinforcement for pressure
• BProvide a backing surface so the root can be made without an open keyhole
• CReplace postweld heat treatment on chrome-moly pipe
• DEliminate the need for any visual inspection of the root

Why is preheat applied to thicker carbon-steel pipe before welding?

• ATo boil cutting oil out of the bevel so the weld turns gold
• BTo melt the land so no filler metal is required
• CTo raise the completed weld above the design temperature before hydrotest
• DTo slow the cooling rate and reduce the risk of hydrogen-assisted cracking

When a piping specification requires postweld heat treatment (PWHT) of a carbon or alloy-steel butt weld, the principal metallurgical purposes are to:

• AIncrease hardness in the heat-affected zone and lock in residual stress
• BRelieve residual welding stress and temper hard heat-affected-zone microstructures
• CConvert the weld to cast iron so it can be peened instead of inspected
• DReplace radiographic examination on every socket weld

What is the main purpose of tack welds on a pipe butt joint?

• ATo hold alignment and root opening so the joint does not shift before the root pass
• BTo replace the entire root pass on stainless pipe
• CTo mark the pipe schedule on the outside of the bevel
• DTo preheat the pipe to PWHT temperature

A consumable insert in a GTAW pipe root is used to:

• AAct as a permanent internal backing ring that remains unfused
• BProvide a pre-placed ring of filler that fuses into a uniform open-root bead
• CInsulate the land so no shielding gas is required
• DIncrease the socket gap to 3/8 inch

For a socket-welded process joint, which statement about the fillet weld is correct?

• AAny visible smear of weld metal is acceptable if the pipe was bottomed in the socket
• BThe fillet must meet the minimum size shown on the B31.3 socket-weld figure, which is bas…
• CThe fillet is sized from the insulation thickness rather than the pipe wall
• DSocket fillets are prohibited on all carbon-steel piping regardless of size

Threaded joints in process piping are generally limited to small-bore, moderate-service lines because they:

• AAre the preferred joint for severe cyclic vibration and high-temperature alloy headers
• BHave lower fatigue and leak resistance than a properly made butt weld and can loosen or c…
• CCannot be sealed with any compound or tape
• DAre required by ASME B31.3 on all NPS 6 and larger Category M lines

A welder is about to join two spools. Which change would require using a different qualified welding procedure rather than simply continuing with the existing WPS?

• AChanging from the qualified SMAW process to GTAW on the same joint
• BSwitching to a new grinding disc of the same grit
• CMoving the work from the morning shift to the afternoon shift
• DUsing a longer tape measure to check the same root opening

Incomplete penetration at a pipe root is best described as:

• AExtra weld metal stacked above the cap
• BFailure of the weld metal to fuse through the full thickness of the joint at the root
• CA uniform oxide color on a purged stainless root
• DSlag that has been completely removed after chipping

On a process-piping job, production welds must be made in accordance with:

• AAny amperage and filler the welder prefers that day
• BThe qualified welding procedure specification (WPS) for that joint
• CA verbal instruction that contradicts the WPS if it is faster
• DThe insulation manufacturer's jacket color chart

What is the center-to-end (takeoff) of a long-radius 90-degree butt-weld elbow?

• A1.0 times the nominal pipe size
• B1.5 times the nominal pipe size
• C2.5 times the nominal pipe size
• D0.5 times the outside diameter

What is the center-to-end takeoff of a short-radius 90-degree elbow?

• A1.5 times NPS
• B5/8 times NPS
• CTwice the outside diameter
• DEqual to the nominal pipe size (1.0 × NPS)

Using the standard pipefitter takeoff for a long-radius 45-degree elbow, what is the center-to-end dimension of an NPS 8 LR 45?

• A3-3/4 inches
• B5 inches
• C8 inches
• D12 inches

What is the travel of a simple 45-degree offset if the offset (set) is 10 inches?

• A10.00 inches
• B12.00 inches
• C14.14 inches
• D20.00 inches

On a simple 45-degree offset, how does the advance (run) compare with the offset?

• AAdvance is always twice the offset
• BAdvance is always half the offset
• CAdvance cannot be determined without the pipe schedule
• DAdvance equals the offset

A rolling offset has a 9-inch rise and a 12-inch roll. What is the true offset?

• A10.5 inches
• B15.0 inches
• C21.0 inches
• D108.0 inches

A 45-degree rolling offset has a true offset of 15 inches. What is the travel?

• A15.00 inches
• B18.75 inches
• C21.21 inches
• D30.00 inches

A 45-degree offset has a 12-inch offset on NPS 4 pipe. The LR 45 takeoff is 2-1/2 inches each. What is the cut length of the diagonal pipe?

• A7.00 inches
• B11.97 inches
• C16.97 inches
• D21.97 inches

What is the center-to-end takeoff of an NPS 8 long-radius 90-degree elbow?

• A8 inches
• B10 inches
• C12 inches
• D16 inches

On a centrifugal-pump suction line, why is an eccentric reducer usually installed with the flat side on top?

• ATo create an air or vapor pocket that primes the pump
• BTo keep the top of the reducer level and avoid a high point that can trap air or vapor
• CTo increase the discharge head of the pump
• DTo convert the suction line into a venturi meter

A 2-inch branch is required on a 12-inch process header. Which fitting is the usual choice when a full-size tee would be oversized and wasteful?

• AA straight 12-inch tee with one outlet blanked
• BA reinforced branch fitting such as a weldolet, sockolet, or threadolet matched to the he…
• CTwo 90-degree elbows welded toe-to-toe on the header
• DA concentric reducer in the header run

Compared with two 90-degree elbows, a 45-degree offset is generally preferred when the pipe must change elevation or alignment because it:

• ACreates more pressure drop and a sharper flow turn
• BProduces a smoother change of direction with less pressure drop
• CEliminates the need to calculate travel or takeoff
• DCan be used only on threaded drain lines

In pipefitting takeoff, the takeout (makeup) of a fitting is:

• AThe weight of the fitting in pounds
• BThe gasket inside diameter
• CThe insulation thickness at the fitting
• DThe distance from the fitting centerline to the point where the attached pipe ends

Two NPS 6 long-radius 90-degree elbows are 48 inches center-to-center. What is the cut length of the pipe between them?

• A30 inches
• B36 inches
• C39 inches
• D48 inches

Under OSHA 29 CFR 1926 Subpart P, a protective system against cave-in is required for employees in a trench when the excavation is:

• ALess than 2 feet deep in any soil
• B5 feet deep or more, unless it is entirely in stable rock or a competent person finds no…
• CRequired only after the trench reaches 20 feet
• DRequired only when water pipe, not process pipe, is being installed

OSHA requires a stairway, ladder, ramp, or other safe means of egress from a trench that is 4 feet deep or more so that no worker has to travel more than:

• A10 feet laterally to an exit
• B25 feet laterally to an exit
• C50 feet laterally to an exit
• D100 feet laterally to an exit

Spoils, equipment, and materials must be kept at least how far from the edge of an excavation unless a retaining device is used?

• A6 inches
• B1 foot
• C2 feet
• D10 feet

Under OSHA construction fall-protection rules (Subpart M), employees generally must be protected from falling when they are working:

• A6 feet or more above a lower level
• BOnly above 30 feet
• COnly when welding, not when fitting pipe
• DOnly on ladders shorter than 4 feet

OSHA 1926.350 requires oxygen cylinders in storage to be separated from fuel-gas cylinders or combustible materials by:

• AA minimum of 20 feet, or a noncombustible barrier at least 5 feet high with at least a on…
• BA cardboard carton placed between the cylinders
• CA 6-inch painted stripe on the floor
• DNo separation if both cylinders have green labels

When compressed-gas cylinders are moved and they are not in a special carrier, OSHA requires that:

• ARegulators stay installed and valve caps be left off for speed
• BRegulators be removed and valve protection caps be put in place before the cylinders are…
• CCylinders be hoisted by a choker sling on the valve cap
• DCylinders be rolled on their side by kicking the valve

Why must oil and grease be kept off oxygen cylinders, valves, regulators, and fittings?

• AOil improves the seal of an oxygen regulator and should be applied weekly
• BGrease is required by OSHA on all oxygen threads
• COil is only a problem on acetylene, never on oxygen
• DOxygen can react violently with oil or grease and cause a fire or explosion

Before a worker enters a permit-required confined space such as a process vessel or manhole, the atmosphere must be:

• AAssumed safe if the last shift reported no odor
• BTested with calibrated instruments for oxygen, flammable gas, and potential toxics in tha…
• CPurged with pure oxygen until a match stays lit
• DChecked only after the worker is already inside

In OSHA construction confined-space terms, an oxygen-deficient atmosphere is one with less than what oxygen content by volume?

• A23.5 percent
• B19.5 percent
• C16.0 percent
• D12.0 percent